Mechanism for imparting an oscillatory movement to a driven element



W. T. EDWARDS.

MECHANISM FOR lMPARTlNG AN OSCILLATORY MOVEMENT TO A DRIVEN ELEMENT.

APPLICATION FILED NOV- 29, I920- Patented Aug. 16, 1921.

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ATTORNEY5 w. T. EDWARDS.

MECHANISM FOR IMPARTING AN OSCILLATORY MOVEMENT TO A DRIVEN ELEMENT.

APPLICATION FILED NOV. 29, 1920. 1,387,697. Patented Aug. 16, 1921.

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UNITED STATES PATENT OFFICE.

MECHANISM FOR IMPARTING AN OSCILLA TORY MOVEMENT TO A DRIVEN ELEMENT.

Application filed November 29, 1920.

To aZZ whom it'- may concern Be it known that I, WILLIAM T. EDWARDS, a citizen of the United States, residing at- San Diego, in the county of San Diego and State of California, have invented certain new and useful Improvements in Mechanism for imparting an Oscillatory Movement to a Driven Element, of which the following is a specification, reference being had therein to the accompanying drawings.

The present invention relates to a mechanism for parting a positive oscillatory and progressive movement to a driven element.

T ie mechanism constituting the subject matter of the present invention is particularly adapted for use in conjunction with valve grinders used in grinding the valves of internal combustion engines, but the invention is not limited to this specific use but upon the contrary the movement employed may be found useful in other relatrons.

In the accompanying drawing:

Figure l is a sectional perspective view of a valve grinding mechanism constructed in accordance with the invention;

Fig. 2 is a plan view thereof,-

Fig. 3 is a sectional perspective view of a slightly modified form of the invention; and

Fig. is a plan view of the construction illustrated in Fig. 3.

Like numerals designate corresponding parts throughout the figures of the drawings.

Referring to the drawings and particularly to Figs. 1 and 2, 5 designates the easing of the mechanism. This casing is pro 'ided with a bearing extension 6 in which a vertical shaft 7 is mounted to oscillate. This shaft carries a. pivoted dog 8 at its lower end, which has projections 9 adapted to engage a valve to be ground in a usual and well known way. The upper end of the shaft 7 is provided with a crank 10 and this crank is connected by a connecting rod 11 with a wrist pin 12 that is carried by a gear wheel 13. The gear wheel 13 is mounted to rotate upon a stud 1i and this stud is in turn carried by a floating disk 15. The gear wheel 13 meshes with a gear wheel 16 and said gear wheel 16 is fast upon an upstanding hub 1'? of a large gear wheel 18. A pinion 19 meshes with the gear wheel 18 and this pinion carries a driving shaft 2o,

Specification of Letters Patent.

Patented Aug. 16, 1921. Serial No. 427,157.

which is the main driving shaft of the entire mechanism. A ring 21 is secured to the rrame 5 by screws 22 and this ring is provided with internal gear teeth 23 with which the gear wheel lS'nieshes.

The shaft is preferably power driven though it isto be understood that the invention contemplates the actuation of this shaft either manually or by power. Rotat on being imparted to the gear wheel 19, it follows that rotation will be imparted to the gear wheel 18, hub 17, gear wheel 16 and gear wheel 13. Rotation of the gear wheel 13 about its axis will result in imparting oscillatory movement to the shaft 7, while the bodily forward movement of the gear wheel 13 around the shaft 7 brought about by the meshing of the teeth of the gear wheel 13, with the internal gear teeth 29, renders this oscillation a forwardly progressive one. In other words, a valve engaged by the projections 9 of the rocking dog 8 would not only be oscillated back and forth over its seat, but each oscillation would move it a little farther ahead than the oscillation preceding it. It is a well known fact that this action is highly desirable in grinding valves, in fact, is essential in order to prevent undesirable grooving of the valve.

In the form of the invention illustrated in F lgs. 3 and 4, 25 designates a shaft which corresponds in function with the shaft 7. This shaft is provided with a crank 26 upon its upper end which is connected by a link or connecting rod 27 with a wrist pin 28 of a gear wheel 29. The gear wheel 29 ro tates about a stud 30 that is carried by a floating disk 31. The gear wheel 29 meshes withgear teeth 32 formed upon a disk 33 that is fixed at 34 upon a stationary collar 35 which constitutes an extension of a frame 36. The gear wheel 29 also meshes with internal gear teeth 37 of a rotative ring 38. The ring 38 is provided with worm 39 upon its outer edge and a worm 10 engages these worm teeth. This worm 40 may be driven either manually or by an electrical motor in a manner well known in valve grinding devices of this nature. hen rotation is imparted to the worm l0 rotation will, in turn, be imparted to the ring 38. Movement of the ring 38 by reason of the engagement of the internal gear teeth of said ring with the pinion 29 will cause the pinion 29 to rotate about its axis formed by the Stud and this through the wrist pin 38, connecting rod 27 and crank 26 will impart oscillatory movement to the shaft 25.

This oscillatory movement of the shaft 25 is rendered a progressive one by reason of the engagement of the teeth of the gear wheel 29 with the teeth of the fixed disk 33, said gear wheel 29 traveling around said fixed disk.

Thus it will be observed that the gear 13 of Figs. 1 and 2 and the gear 29 of Figs. 3 and 4 have a planetary movement. That is they rotate about their own axis and, in addition, have a bodily forward rotative movement about the shafts 7 and 25, respectively.

It is to be understood that the invention is not limited to the precise construction set forth but that it includes within its purview whatever changes fairly come within either the terms or the spirit of the appended claims.

Having described my invention, what I claim is: 4

1. A device of the character described comprising an oscillatory shaft, a crank thereon, a rotative gear Wheel, a wrist pin carried by said gear wheel, a connecting rod between said wrist pin and said crank, a

floating disk, a stud carried by said floating disk upon which the gear wheel is journaled for rotation and a pair of gears with which the first named gear wheel meshes, one of which lies inwardly of said first named gear wheel and the other of which lies outwardly thereof and all of which gears lie in substantially the same horizontal plane, one gear of the pair being fixed and the other gear of the pair being mounted for rotation and means for imparting rotation to said rotative one of the pair of gears.

2. A device of the character described comprising an oscillatory shaft, a crank thereon, a rotative gear wheel, a wrist pin carried by said gear wheel, a connecting rod between said wrist pin and said crank, a floating disk, a stud carried by said floating disk upon which the gear wheel is journaled for rotation, a rotative element comprising a central collar surrounding said shaft, a gear wheel fixed upon said collar and meshing with the first named gear wheel and an internally toothed ring disposed outwardly of the first named gear wheel and with which the first named gear wheel meshes.

In testimony whereof I hereunto affix my signature.

WILLIAM T. EDWARDS. 

